Molding material gas determinator



j.. M, E94?. H. w. DIETER-r Em. 294349354 MOLDING MATERIAL GAS DETERMINATOR 4 rFiled Dec. 4, 1944 INVENToRs HARRY w. DIETERT BY ROBERT I .ooELMAN FIGA.

mi2/@4W ATTORNEYS Patented Jan. 14, 1947 Hairy w. Dieter@ and Robeit'jL.'` orientan; De;

troit, Michi;` sad"Doelman assigner to said Dietert Application December 4, 1944, Serial No. 566,534

6 Claims. 1

The invention relates ingthe `amount of gas or vaporwhichisevolved from a specimen and will accurately measurehthe same. 'Io-this end the invention consists in the construction as hereinafter set forth.

In the drawing: 4 Y y l Fig. 1 is a vertical central section through our improved apparatus;

Fig. 2 is an enlarged section through the base. showing thesealing -means together with a means fordissipating heat so as to maintain this base at a substantially constant temperature;

.Fig. 3 is a horizontal section on line 3 3, Fig. 2; and

Fig. Llis `a lonigtudinal section through a mold` edY specimenA to be tested,v arranged within the gas retaining chamber.

The material to be tested may either be a loose mass held in a suitable container, such as A, or

a molded specimen, such as B. In either casethis` material is placed within a'refractory tube C and is inserted within a furnace D where it is raised to the desired temperature. The tube C is preferably formed of silica or other equally refractory material and is closed at its upper end, Its lower end is initially open for the insertion of the sample which is supported on a refractory post E after which said lower end is closed with the provision for the passage oflgas. and vapor outward through a central tube F. It is then led through a conduit G to a manometer or other gas measuring means diagrammatically indicated at G which measures the amount of gas and vapor evolved. As the heat of the furnace will be conducted downward through .the tube C and post E, it is necessary to -provide heat dissipating means so as to maintain the gas and vapor being measured at a predetermined temperature. This is preferably accomplished by the following construction.

H is a hollow head having an upwardly opening cup-shaped chamber K for receiving the tube C and having a surrounding annular chamber J for the coolant. This hollow head is preferably formed of a base member I having therein an axially upwardly extending passage I and a radially extending transverse passage I2. The base is also formed with an upwardly extending portion I3 of reduced diameter and `another extension I4 of fur-ther reduced diameter. J is va tubular member surrounding the portion I3 and extending upward therefrom being connected to the base member I by soldering or other means for forming a sealed joint. K is a tubular member surroundto apparatus formtevsting moldedmaterial and more particularly forni-,est-AY l 2 ing" the portion I4 andextendingy upward to" a point. above the member J. Said tubular member K forms withsaid portion I4 the upwardly opening'pup-Shaped chamber'K". Acap memberL surrounds the `portionK and engages the member J. `Preferably said member L is soldered 'or'otherwise sealed to these'membe'rs J and K and 'forms therewith the annularch'amber J Radially eX- tending tubes M and M are connected to the chamber-J* through5 apertures 4near the lower and upperends'of the'memberJ. A stopper N formed lof resilient material, suchfas rubber, is inserted inthe lower end 'of the tube'C to close the same and "this 'stopper' has'extending therethrough va tube F', the lower end" of which is inserted in the' passage I'. of the head I. Surrounding the stopper within' the member K there is placed aquantity of mercury f or conducting the heat from the lower end @if the, tube. Gand from 'the stopper Nto the. inn -wallnKwof thepcoolant chamber J The tube Fhas a head F at its upper end which the post El and through thek latter the specimen to betested within the tube C.

vwith' the" @retraction as described, the han` His supported 'on asuitable laci-,fuating rod P byr which it may beraised'or lowered to carry the tube 'C upward vintoA the furnace D. After the specimen fhas'been'placed'within the tube C upon the'npc-st E; the `stopper-N is inserted within the lower end of "the .tubeCgandthe 'tube F; which supports the post, has its lower end inserted into the passage I. Mercury is then placed within the member K and the tubes M and M are connected to a circulatory system (not shown). The heat of the furnace will raise the temperature of the specimen to the desired degree and any gas or vapor evolved will lpass downward through the tube C, entering the tube F and from the latter passing the tube G which leads to the manometer. By suitably regulating the flow of coolant through the annular chamber J the temperature of the head H may be held substantially constant preferably at near the boiling point of water at atmospheric pressure. This will avoid or limit condensing of any water vapor within the tube C so that substantially all the gas and vapor evolved will p-ass to the manometer.

What we claim as our invention is:

1. A gas and vapor determinator for molding material, comprising a refractory container in which the material to be tested is placed, a closure for said container having an outlet port therethrough, a conduit connecting with said outlet port, gas measuring means connected to said conduit, means for heating the portion of said container having therein the material to be tested, and means for cooling said closure and portion of said container adjacent thereto to a temperature not far from the boiling point of water at atmospheric pressure.

2. A gas and vapor determinator for molding material, comprising a refractory container in which the material to be tested is placed, a closure for said container having an outlet port therethrough, a conduit connected to said outlet port, gas measuring means connected to said conduit, means for heating the portion of said container having therein the material to be tested, and liquid cooling means surrounding said closure and adjacent portion of said container adapted to maintain the same at a temperature not far from the boiling point of water at atmospheric pressure.

3. A gas and vapor determinator for molding material, comprising an upright refractory container in the upper portion of which the material to be tested is placed, a stopper for the lower end of said container having an outlet port therethrough, a base member beneath said stopper and having a passage in communication with said outlet port, a tubular member forming with said base member a cup encircling said stopper and the lower end of said container, means surrounding said cup and forming therewith an annular chamber, a conduit in communication with the passage in said base member, gas measuring means connected to said conduit, means for heating the upper portion of said container, a mercury bath in said cup surrounding said stopper and lower portion of said container and forming thermal conducting means therefrom, and means for circulating a uid coolant through said annular chamber to dissipate the heat and maintain said mercury bath at a temperature not far from the boiling point of water at atmospheric pressure.

4. A gas and vapor determinator for molding material, comprising an upright refractory container in the upper portion of which the material to be tested is placed, a refractory holder for said material disposed within said container, a stopper of resilient material for closing the lower end of said container, a tube extending through said stopper, a base member having a passage in communication with said tube, a tubular member forming with said base member a cup encircling said stopper and the lower end of said container, means forming with said cup an annular chamber, a conduit in communication with the passage in said base member, a gas measuring instrument connected to said conduit, connections with said annular chamber for circulating a fluid coolant therethrough, and a mercury bath placed in said cup to surround said stopper and adjacent portion of said container to conduct heat therefrom to said coolant.

5. A gas and vapor determinator for molding material, comprising a container in which the material to be tested is placed, a closure for said container having an outlet port, a conduit in communication with said outlet port, gas measl uring means connected to said conduit, means for heating the portion of said container having therein the material to be tested, and means for cooling said closure and portion of said container adjacent thereto to a predetermined constant temperature.

6. A gas and vapor determinator for molding material, comprising a base member provided with a passage, a tubular member forming with said base member an upwardly opening cup for mercury, means forming with said cup an annular chamber for a fluid coolant, an upright elongated container in which the material to be test-l ed is placed, the upper end of said container be:- ing closed, thelower end of said container being open and disposed within said cup, a stopper for said open end of the container Within said cup,

means within said container for supporting theA material to be tested including a tube extending through said stopper and in communication with the passage in said base member, a'conduit in communication with the passage in said base member, gas measuring means connected to said conduit, means for heating the upper portion of said container, and means for circulating a iiuid coolant through said annular chamber to dissipate heat and maintain the mercury in said cup at a temperature not far from the boiling point of water at atmospheric pressure.

HARRY W. DIETER'I.k ROBERT L. DOELMAN. 

